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  1. Keroes: Direct-Coupled amplifier
  2. Tube ID help please.
  3. exactly HOW does a tube amp work? or a vacuum tube?
  4. David Berning's zh-230 - whats going on here?
  5. EICO HF86 scratch build question please
  6. what to do with a 12W 600ohm to 4/8 ohm output transformer?
  7. Telewatt VS71M
  8. Yamamoto 09S 300B SE Amp Problem
  9. Marantz-9
  10. 6V6 amp question
  11. Wood chassis
  12. My first project SE(T) into high end audio.
  13. Supermalloy for the Power transformer?
  14. Can I build a screen reg. with IXYS 10M45?
  15. Modified DynacoMkIV
  16. Refurbising Conrad Johnson Premier One
  17. Would using a 16ohm speaker damage my SE output transformers?
  18. Grommes/PE S-35 questions
  19. Concertina phase inverter with LED bias - is this completely wrong?
  20. Parafeed turn-on delay
  21. I'm looking for 6an8 (as V1) schematics
  22. New Project - EL84 PP and preamp - suggestions welcome
  23. The sound of modern transformers compared with vintage gear
  24. Determining the core cross sectional area, Afe, for SE OPT
  25. HT power supply high?
  26. under-run push pull
  27. 12B4 Linestage Woes
  28. Transcendent Sound Mini-Beast
  29. A Question About Positive Feedback
  30. Help with opera consonance M100plus
  31. Just received 2x PT Choke OT. best implementation ?
  32. Just received 2x PT Choke OT. best implementation ?
  33. Mystery Valve ID
  34. Oddball OT with extra secondary winding
  35. Help with Multi Section Can Cap replacement
  36. 600V bench variable supply to test transmitting valves
  37. Heater-cathode voltage spec interpretation
  38. Tell me why this wont work.
  39. headphone amp for Senns HD600
  40. Transformer orientation and suggestions.
  41. 12AU7 stereo SE mini-amp build!
  42. allen type 20a schematic
  43. 2010 lemon year for EH 6922 tubes
  44. Chinese GU50 PP
  45. Gain, Vpp and attenuation at each stage
  46. 6n14p headphone amp
  47. Heater Lifter
  48. KT88 & 6550 Pentode power output?
  49. Biasing Improved Williamson
  50. Lowering the Volume Control on Tube Amps
  51. Got the Hum out!! Thanks All
  52. How hot KT88 get? Anybody take a reading?
  53. Broskie Unbalancer
  54. Phase splitting transformer design
  55. Red plate KT88
  56. 6N16B preamp
  57. Eimac 450th nos
  58. how much clearance above tubes for KT88 enclosure
  59. Cathode preheating???
  60. RIAA Question - Power
  61. Linearity of Red RCA 5692
  62. What gauge enclosure for KT88 AMP?
  63. Output Transformer Issue???
  64. Maggie 8802 placement issue
  65. Can you recommend a tube tester?
  66. 6550 tube protection socket
  67. PT laminations are usable as OT laminations ?
  68. Are These Authentic Russian Military 1578 Vacuum Tubes?
  69. Amp ID Please
  70. Help for Main Transformer Spec for CCDA
  71. Switching SE and balanced inputs/outputs
  72. kt88 PP rectifier.
  73. How much Blue glow is ok?
  74. Recommendations on How To mono a pre amplifier?
  75. 6H6pi curves available?
  76. 1p24b
  77. help, Built from scratch Kalamazoo 2 noise
  78. 5CZ5/5BQ7A single ended amp
  79. Hopefully a simple question.
  80. 211 tube recommendations
  81. Need HELP with TUBE IMP
  82. Another unknown tube
  83. Triode Bias 101
  84. Bogen MO-200A transplant /conversion
  85. 5U4 o bridge rectifier
  86. Choosing the right transformer
  87. V-Cap Help
  88. Older tubes sound better
  89. 6J7 preamp
  90. Menygue mini/music angel amp
  91. Driving a Behringer INuke Nu1000
  92. cathode follower ecc88 on 60volt
  93. Docs for Heathkit AA-23?
  94. 45 tube amp schematic
  95. Old TO-R s15u, Should i fix it?
  96. Tube ID
  97. VTL driver tube question
  98. Fun with junk EL84 SE
  99. Enclosure ideas
  100. Burn in procedure for NOS necessary?
  101. Strange Lorenz ECC81 12AT7
  102. Amplifier first start up; Plays tone of signal generator with no speakers!
  103. Reports of the death of Audiophool have been greatly exaggerated
  104. help me identify some vintage tubes // need suggestions for possible applications!
  105. Lowering cost of audio output transformer
  106. Source for transformers in Europe
  107. morgan Jones HT caps & Anode Loads
  108. Tuning Negative feedback
  109. Hickok reference 6L6 for calibration..
  110. SET-NO FEEDBACK amplifier performance
  111. Stereo class A 6+6W - 2x 6L6G 1 x 6N2P
  112. Console Amplifier Pull:Voltages over Spec
  113. Help! My EL34B based amp arced at full volume.
  114. MUZAK 50's tube amp
  115. Tube break-in?
  116. Custom power tranny specs recommendations for 300B pse monoblocs
  117. mosfet source follower output stage.
  118. Winter upgrade project - new heating unit
  119. 6KM8 amp
  120. Power and output transformers to ground.
  121. Help with this schematic? B+? B++?
  122. What to do with this old amp? suggestions please.
  123. DIY CAT SL1 preamp
  124. Phase inverter, your comments welcomed!
  125. Basic Bias Question for PP Amp
  126. Oddwatt 5751/6550
  127. Please help me to identify Telefunken PCC ...
  128. Modification of 300B SE Amplifier
  129. 300B Tube and Amp Questions
  130. ST70 "Imposter"
  131. cathode follower question
  132. marconi tubes....can someone idntify these
  133. DeathTrap400 : : A Pretty Damn Good 300B Amp
  134. SOS: First Build, Lots of Hum
  135. KR Audio Marconi R valve amp?
  136. Distortion
  137. Tung-Sol 6098/6AR6 Substitution
  138. Dropout in RTP3 phono stage
  139. Audio Research EC-3 modification
  140. 300b all-DHT SET
  141. My first tube project !
  142. Trouble with homebuilt amp
  143. Music angel el34b problem
  144. The end of tubes?
  145. Two stages EL34 power amplifier
  146. 7199 replacement in AMPEX 6973
  147. IT coupled tube-SS hybrid amp suggestion- needs development
  148. Original Cary CAD-300se upgrades?
  149. Convert Integrated Tube Preamp to an amplifier
  150. McCurdy AM405 Schematics
  151. Looking for Neumann N149 power supply schematic
  152. B&K model 747 tube tester for EL34
  153. Behringer DEQ2496 for testing amplifiers and preamps frequency response ???
  154. I need datasheet of 8753 tube, help me!
  155. New 6L6GC Project. DC -> LTP
  156. EL84 in UL
  157. 1953 revere amp conversion
  158. Manley transformer specifications
  159. Recommended 300B SE Amplifier Designs
  160. Found a new interstage coupling method (?)
  161. Amplifier Distortion (Northern Electric)
  162. when do filament supplies need to be floated
  163. gm70 filiment transformers
  164. Replacing 6922 Preamp Tube in ARC LS7
  165. Please educate me: Tube testing, the life test, and Grid Leakage
  166. 6AR6 6098 Triode PP Load Line
  167. music reference rm5-4 schematics
  168. S5 K-12G output trans
  169. Transformer center tap question
  170. EF86 + 4*EL84PSE
  171. solid state relays for plate load switching?
  172. Dont have a power transformer?
  173. Kora Equinoxe Triode or Blue Circle BC-21.1 preamp?
  174. Pre-Amp For my Tubelab Simple P-P
  175. Power Transformer Help
  176. Analog Metric 2A3 PP Kit
  177. Good, starter OTL kit
  178. Dual SE amplifier? - (not PSE) - Take two!
  179. Mysterious SE OTL headphone amp from China?!
  180. Inv. Futterman with gain stages between PI and O/P?
  181. PSU configurations for tube amp
  182. HP Model 712b Regulated Power supply
  183. Dynaco low Power Amp
  184. 300b power suply
  185. Very Strange Preamp Issue
  186. WTB: I am looking for a Freed 1400V or Chicago 1200V/1400V Potted Power Transformer
  187. tube transformer suppliers in Mercosur
  188. Please Help: 6CJ3 Damper Diode Tube as Rectifier Question
  189. time delay sophia electric
  190. Twisting the leads of filter choke
  191. This SPUD's 4 U
  192. I am Looking for tubes
  193. Thuan
  194. Nanjing 6V6GT ( 6P6P)
  195. Should I keep this old stuff?
  196. 300b
  197. ganged output transformers
  198. Holco H4P Resistors, Should I use them?
  199. 6BX8 curves, help !
  200. SANSUI AU-70 or 1000A???
  201. General Electric YTW-1 Tube Checker
  202. Ground or amp hum-which?
  203. need help to fix the "hiss" on my tube preamp
  204. Best SE interstage 1:1 for min. 15mA?
  205. Dual Single Ended Amplifier? - (not PSE)
  206. RIP Forum Member "Ivey"
  207. valves to replace opamps in cd player
  208. Replacing capacitors on Audio Research D40 power amp.
  209. No sound and low B+?
  210. Replacing capacitors on Audio Research D40 power amp.
  211. 2 Channel Tube Amp and Sub Connection
  212. EZ125 Amp Project
  213. Yaqin MS-22b Phono Amp
  214. First post and a couple P.P. questions
  215. adding a preamp to tube power amp
  216. 6SN7 6N8S preamp suggestions
  217. 300b polarity
  218. Electrolytic capacitor vs extra triode stage
  219. WE JAN 274B Dating
  220. EICO 666 Tester Help
  221. Hickock 550X signal voltage
  222. First Headphone tube amp kit to build??
  223. Anyone owns a Dynavox VR-307 Amplifier ?
  224. NOS potted Chicago Transformer 1BC-150
  225. capacitor voltage for tube amp power supply
  226. 808 SE Design Help!
  227. Why can't I build my own ARC LS-5 or CJ PV-12?
  228. Post-mortem on a 80 year old 2A3 amp
  229. 6e5p gm70 with 6d22s?
  230. 6L6-6V6-EL34-KT88-6CA7-EL84
  231. Scheme for SE amp
  232. $16,000
  233. Hybrid power amp
  234. Diagnosis please
  235. BK 707 Tube Tester Mods
  236. monarch 614
  237. Separate Filament and B+ Switches
  238. Dynaco Low Power with 12AY7's
  239. PTP kits available?
  240. Which OP transformer and materials?
  241. Power of Tube Amp and Transistors Amp
  242. testing tubes
  243. current servo not voltage.
  244. Help Me, How to make Pre-amp using 12AU7 tube and Op-Amp Ic mix?
  245. 300b filament
  246. DHT SE auto bias circuit
  247. Anyone try swapping 6SN7 w/ 6F8G
  248. Eliminating Cathode Bypass Caps In SET Amplifier
  249. Nano vacuum tube
  250. Help High Line voltage

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